Check out the conversation between MuscleNerd and iPodguy79 on Twitter:

@sherif_hashim @MuscleNerd @iphone_dev @chpwn keep up with your soap opera and geo will be slapping another reality check on you

Musclenerd Replied: @ipodguy79 I hear geohot does have an untether actually! Though not for all devices.

For the people who are unaware of the developer, George Hotz (GeoHot) is the famous for purplera1n, Blackra1n Jailbreak and Limera1n Jailbreak and his work on PlayStation 3 [PS3] hacking.

While iPhone Dev Team is still working to remove bugs in the current Redsn0w 0.9.7 beta version for untethered iOS 4.2.1 JB. Comex solution for untethered jailbreak has no estimated time of arrival and he might have saved his solution for iOS 4.3 jailbreak.